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Resource Documents by van den Berg, Frits

van den Berg, Frits
Why is wind turbine noise noisier than other noise? 
ABSTRACT. For residents near modern wind farms wind turbine noise is more annoying than other important noise sources, when comparing equal sound levels. Acoustically this may be due to the diurnal course of the noise and the rapid fluctuation in level related to the rotation, which are not usual features of most transportation and industrial noise sources. It can also be a result of non-acoustic factors such as visual intrusion and the perceived distribution of benefits and adverse effects. In . . . Complete article »

van den Berg, Frits
Wind turbine noise: an overview of acoustical performance and effects on residents 
Sound from modern wind turbines is predominantly aerodynamic noise with most audible sound energy at medium and higher frequencies. Wind turbine sound is relatively annoying, probably due to acoustical characteristics, such as amplitude modulation, that increase the risk for annoyance and disturbed sleep. Other health effects, all resembling stress symptoms to at least some degree, are attributed to infrasound, but this is not supported by existing knowledge of noise or noise annoyance and the claims lack substantiation. There is certainly . . . Complete article »

Pedersen, Eja; van den Berg, Frits; Bakker, Roel; and Bouma, Jelte
Can road traffic mask sound from wind turbines? Response to wind turbine sound at different levels of road traffic sound 
Abstract: Wind turbines are favoured in the switch-over to renewable energy. Suitable sites for further developments could be difficult to find as the sound emitted from the rotor blades calls for a sufficient distance to residents to avoid negative effects. The aim of this study was to explore if road traffic sound could mask wind turbine sound or, in contrast, increases annoyance due to wind turbine noise. Annoyance of road traffic and wind turbine noise was measured in the WINDFARMperception . . . Complete article »

Pedersen, Eja; van den Berg, Frits; Bakker, Roel; and Bouma, Jelte
Response to noise from modern wind farms in The Netherlands 
Abstract: The increasing number and size of wind farms call for more data on human response to wind turbine noise, so that a generalized dose-response relationship can be modeled and possible adverse health effects avoided. This paper reports the results of a 2007 field study in The Netherlands with 725 respondents. A dose-response relationship between calculated A-weighted sound pressure levels, and reported perception and annoyance was found. Wind turbine noise was more annoying than transportation noise or industrial noise at . . . Complete article »

Pedersen, Eja; Bouma, Jelte; Bakker, Roel; and van den Berg, Frits
Response to wind turbine noise in the Netherlands 
Abstract: A cross-sectional study with the objective to explore the impact of wind turbine noise on people living in the vicinity of wind farms was carried out in the Netherlands in 2007. A postal questionnaire assessing response to environmental exposures in the living area, including wind turbine noise, was answered by 725 respondents (response rate: 37%). Immission levels of wind turbine noise outside the dwelling of each respondent were calculated in accordance with ISO-9613. The risk for being annoyed by . . . Complete article »

van den Berg, Frits; Pedersen, Eja; Bakker, Roel; and Bouma, Jelte
Wind farm aural and visual impact in the Netherlands 
Abstract: The WINDFARMperception project, carried out in 2007/08 in the Netherlands, aimed to explore the impact of wind turbines on people living close to wind farms. The study group was selected in three types of area (countryside, countryside with major road, built up area) by means of a Geographic Information System (GIS). Each selected address was sithin 2.5 km of a wind turbine of at least 500 kW electric power and a similar turbine within 500 m of the first. . . . Complete article »

van den Berg, Frits
Effect of Atmospheric Stability on Low Frequency Modulated Sound of Wind Turbines 
Abstract: Sound from wind turbines involves a number of sound production mechanisms related to different interactions between the turbine blades and the air. An important contribution to the low frequency part of the sound spectrum is due to the sudden variation in air flow which the blade encounters when it passes the tower: the angle of attack of the incoming air suddenly deviates from the angle that is optimized for the mean flow. Hitherto, low-frequency sound from wind turbines has . . . Complete article »

van den Berg, Frits
Effect of atmospheric stability on wind turbine sound and microphone noise 
Doctoral Thesis, 12 May 2006, University of Groningen, the Netherlands Godefridus Petrus van den Berg IV.3 Wind turbine noise perception There is a distinct audible difference between the night and daytime wind turbine sound at some distance from the turbines. On a summer’s day in a moderate or even strong wind the turbines may only be heard within a few hundred meters and one might wonder why residents should complain of the sound produced by the wind farm. However, in . . . Complete article »

van den Berg, Frits; Pedersen, Eja; Bouma, Jelte; and Bakker, Roel
Visual and acoustic impact of wind turbine farms on residents 
Wind turbines more annoying than expected The WINDFARMperception project shows that the sound of wind turbines causes relatively much annoyance. The sound is perceived at relatively low levels and is thought to be more annoying than equally loud air or road traffic. This may be caused by the swishing character of the sound or because at night it does not decrease in strength – which is usually the case for traffic noise. Also in this study more disturbance of sleep occurs . . . Complete article »

van den Berg, Frits
Wind turbines at night: acoustical practice and sound research 
Presented at the Euronoise 2003 conference, Naples. Download original document: “Wind turbines at night: acoustical practice and sound research” Complete article »

van den Berg, Frits
Do wind turbines produce significant low frequency sound levels? 
Summary: Wind turbines produce low frequency sounds, but it has not been shown this is a major factor contributing to annoyance. Sound from wind turbines involves several sound production mechanisms related to different interactions between the turbine blades and the air. Low frequency sound is predominantly the result of the displacement of air by a blade and of turbulence at the blade surface. An important contribution to the low frequency part of the sound spectrum may be the result of . . . Complete article »

van den Berg, Frits
Effects of the wind profile at night on wind turbine sound 
Abstract: Since the start of the operation of a 30MW, 17 turbine wind park, residents living 500 m and more from the park have reacted strongly to the noise; residents up to 1900m distance expressed annoyance. To assess actual sound immission, long-term measurements (a total of over 400 night hours in 4 months) have been performed at 400 and 1500m from the park. In the original sound assessment a fixed relation between wind speed at reference height (10 m) and . . . Complete article »

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